require 'digest/sha1'
class User < ActiveRecord::Base
  
  # Virtual attribute for the unencrypted password
  attr_accessor :password

  validates_presence_of     :login, :message => "用户名为必填项"
  validates_presence_of     :email, :message => "Email为必填项"
  validates_presence_of     :password, :message => "密码为必填项"
  validates_presence_of     :password_confirmation, :message => "确认密码为必填项"
  validates_confirmation_of :password, :message => "两次输入的密码不一致"
  validates_uniqueness_of   :login, :message => "用户名重复，请换个别的用户名试试"
  validate :validate_login
  validate :validate_email
  before_save :encrypt_password
  
  def validate_login
    errors.add(:email, '用户名不合法，只允许字母|数字|下划线') if !(self.login =~ /^[A-Za-z0-9_]+$/)
  end
  
  def validate_email
    errors.add(:email, 'Email不合法') if !(self.email =~ /(.+)@(.+)\.(.+)/)
  end
  
  # prevents a user from submitting a crafted form that bypasses activation
  # anything else you want your user to change should be added here.
  attr_accessible :login, :email, :password, :password_confirmation

  # Authenticates a user by their login name and unencrypted password.  Returns the user or nil.
  def self.authenticate(login, password)
    u = find_by_login(login) # need to get the salt
    u && u.authenticated?(password) ? u : nil
  end

  # Encrypts some data with the salt.
  def self.encrypt(password, salt)
    Digest::SHA1.hexdigest("--#{salt}--#{password}--")
  end

  # Encrypts the password with the user salt
  def encrypt(password)
    self.class.encrypt(password, salt)
  end

  def authenticated?(password)
    crypted_password == encrypt(password)
  end

  def remember_token?
    remember_token_expires_at && Time.now.utc < remember_token_expires_at 
  end

  # These create and unset the fields required for remembering users between browser closes
  def remember_me
    remember_me_for 2.weeks
  end

  def remember_me_for(time)
    remember_me_until time.from_now.utc
  end

  def remember_me_until(time)
    self.remember_token_expires_at = time
    self.remember_token            = encrypt("#{email}--#{remember_token_expires_at}")
    save(false)
  end

  def forget_me
    self.remember_token_expires_at = nil
    self.remember_token            = nil
    save(false)
  end

  # Returns true if the user has just been activated.
  def recently_activated?
    @activated
  end
  
  def profile
    Profile.find_or_create_by_user_id(self.id)
  end
  
  def update_avatar_path(avatar_path)
    _profile = self.profile
    _profile.avatar_path = avatar_path
    _profile.save!
  end

  protected
    # before filter 
    def encrypt_password
      return if password.blank?
      self.salt = Digest::SHA1.hexdigest("--#{Time.now.to_s}--#{login}--") if new_record?
      self.crypted_password = encrypt(password)
    end
      
    def password_required?
      crypted_password.blank? || !password.blank?
    end
    
    
end
